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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daee6ba7e98421e220409e9b0de93ddf4608c78d91e16ec8930c0b1672974e4c' 
  AND token = 'yI4mN1D09X03z5dZhduWTtO2SFLKrpbNS+OM9Py3gaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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