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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9442db1d4279d773db566a57bdd5bc08ed19bb9ea76ed2a7b1ebe237d344a19c' 
  AND token = 'hKEdzmTZczKXH49o0LPY0S5odzeKzOsTnvak3kFW6Zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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