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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '222d1a913d42a5c417ced1eb68c0ec5cdb5bf76694fe4931793fa8eccd0d2f35' 
  AND token = 'wcUO1PjgcU1jYHrac5a72Eb9z6S7VoHT188dgtZ8blA=' 
  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"
    }
  }
}