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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fad70c737879224ea77cff778020d749467624e3345b309afe1bef336e6ec97a' 
  AND token = 'yeTQ6Obo/K0TXZUaYQpR47Gi43vhVkn+9cX1eWCghoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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