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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f94c444cd9d7ed840d6717a592e34d3f00675ac25eead7503c3e38f286479dd' 
  AND token = 'OZ49jm/dafxOrE/VIrYCRwDUp5ladVg7Kss3nSdoD4g=' 
  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"
    }
  }
}