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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdad7a27e4f43ba52925c69ce27f780e2212f0797828318d27ef9f4f8f7d1bdd' 
  AND token = '9qDsauuRpTDQ4RqGg/SvGfO/YC+ryW4F1K2ufNGfONU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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