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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '886362f77ee77b1ac9cabad56a518b37fb788b447d8bc559f3549eed58605541' 
  AND token = 'UUD7ZvrVmg4yLIh70iPxlPtNBVrUUXrG4rEVXlwOVbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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