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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9de6cd52a99309a4e554dc5b3cf7bfbbac4f935eff259e6e0824f3751a775674' 
  AND token = 'PBTy9/lXmDHZ4zltz3xwiXwaXZe5553c0CLVlJRmR/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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