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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eccdc3a85c5fa08f9df538cf32ef36bed260a34ab6741981a3c4c6b24c0e15e' 
  AND token = 'T4RsGETQYJC4r8QNsmY0XqB7Cfir5bCbflMv44pr+2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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