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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '214d53e62017cf63343122b21682defd5694f41873f8e2ebe6aa719666b0e14d' 
  AND token = 'H8tNBIn8+1EKLHHU6Mx9NZgy9RVyfds0EpnZfaIt3qU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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