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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33e63e0a46bd1c79eef9086706bf3e26167fe0efbc6566ad3e6f58b69f0a5f18' 
  AND token = 'n1YRdkxCcGQXNwOOiheJI+8jDBGk280oHqrFUfkQkJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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