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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df20492c29ca84c681b6d2e9299db56e0458f2f2692fe391386961751b8ddb5e' 
  AND token = 'nZy9VGpUcrDF5CL+iayF1arONhEkepIWesAjOX1W36M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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