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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3618ec9da5e27109d6e29ff20fb1b62f5f4f810295cf98ac4c7e0852099f2079' 
  AND token = 'MNjNcmRoftAcT5adbog6PVbM5MSGcp4CtYAluNZQwDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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