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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd57efa6b89db1ed355ff27b0fd4960ad36a231d60d902312007e9c24cd577ec6' 
  AND token = '0xuFavxpdK2uy++RMllgC1e8AZ7zv8x/TNFELBIL0E4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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