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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d673c1244063734ab706ab080ab183e24cea20023fe21b9ec8806878f708b4e' 
  AND token = '6vBlLacDUjWxKCsBJCvy8vh00FRGBL7WV9BYG1IpD7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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