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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f60377969af6af86eb177812d019d4364693aae8f18bf6ac448b64a028d4371c' 
  AND token = '7AlYvncE2ElEi9DjySviPliJ+6hPjbemy65MoTKWG7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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