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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da56ec747b65c53ae718be94467f3f470947487d0278cae0b4a83b668dbf2d72' 
  AND token = 'N5pVvy6QmuRRDouF2jbT40s4yUtJH35vUuPXRmnX0FA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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