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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceec7ce115784ebaeb8c4ade877aaa330341cd23536e8d0f60055bd0537d83fd' 
  AND token = '1L0BeGPCuoPw7oromnILI2I+8ylcmxFEVhTB5+u5KyA=' 
  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"
    }
  }
}