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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32f18bc4f36f80286f2065e2042e90a1df27a35b4e94c715b99a982c8da2b0bb' 
  AND token = 'gOk9+inPjsYSAkQagdTW0IMxAQCxwRGyRLCM6vnp2VU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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