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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e07d6733d2c4c955283cd87aa9f4266b2ea4c9dae95e1d2894f7bc634d1b924' 
  AND token = 'XTNINWx5BuxCuuLPo5Ufzbtoh9L8IGNbpG+YUe/77EE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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