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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39b1d8bf7bc775267859744116b9a4339fe7677e20432d1a55668ab00e66b0e2' 
  AND token = 'hsHVhn3Oar56dEdWX9aicYAGQ4uhaKiOymLZ4u6M7go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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