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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5430b7973ce7f6183d08c34d8f647ab848a0cda9dbfc4b5433d1408d71e9b206' 
  AND token = 'Qr9fKgoie7Rqowsc+a6idGYJ4Vco3q8C+Fejy4drfhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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