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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5540ffe0d4de37681cc08ebd643a5f151ffa6f255a08fdbb1f87524657cfb69e' 
  AND token = '2nsW2BgmGDdBOsosjRF6JUapwr6qiaof92nKdf5CIwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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