SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cc610d99228bf66055d7e0afa206bcba47f47a237419e6e3b44409344455bb8' 
  AND token = 'CfzBPw3JrjwdwQP/GNlhHepYG6qkl+0s/Po4Spyqu58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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