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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f59b6b8ab26174de877597d2156002c843ff885a0091b58f7541524cf20187b' 
  AND token = 'I5RCdEcA04IR7vyw1jRZewbm3GzGf3hPofYE+VLuiHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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