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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c884737a7b87d0467fba3e3ed73c7e507ad8071b892f22528fd949b46ad34f10' 
  AND token = '8R+meaE5IAK056uotcg3djmn3i+u3mj3/JSNVTzfkxE=' 
  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"
    }
  }
}