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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '373bb5341d81106e8fee61847ec23bb17bafc0f06cf8ae4946608d00e864d5e0' 
  AND token = 'AHg1+vLCOEtJeIwuaW6g/oup2GRDUF9au4gUi6re0b0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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