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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52b9e4fb44b3d4b8a6b32bca4d299f5a584fd6c616c4d3bc5b75b89d5c356b60' 
  AND token = 'ZbBsWOkRcSc6nH8YzVPwNcEgef2cf4Du2vO+snJ8sFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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