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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faec10b41bc30ce9c7a8ce3e425bfb4a960641e4d7c38fe81880718f32ba8e04' 
  AND token = 'mq//ed+OUhA0LwesQAVRGQSlNyKuwhKE1Gq/zJe1XfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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