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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b855b0fd4d3671d35dd1374130a27312122cc6f3e9de806e11be654d30cdd93f' 
  AND token = 'Vkn9H7WfZDyk1cbjXNIskhplQISpWB7DW4lhbRY5eJ4=' 
  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"
    }
  }
}