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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a522e9d58edd8b9560f135e1fadb9c7345a8d0518d6d93cb3bb86876d4f3b6e' 
  AND token = 'hQoNlkdfQM/cQVZJaD2Kl3b8ElW7WM87xAwNF9QoB2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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