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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a645899bbce9af9aed5cf50d19309c140f7ad7e5ab3c1d12f45710d5e666ba6d' 
  AND token = '0gTI7vZOjpBkPXv4t4FtQoabIRgUj02nAX5nqgTu9W0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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