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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '874e9dff583d691461bd4ea5a6c31539e1853b054e7aa1dd98f48a62a00e8898' 
  AND token = '7POWI7y1uyC0tElv8m0GcpHA8nqF3Tr0XCvkjcpz6us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}