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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6cf116dbb9aec870dbb1a733add323c986593a1182d39c171a2fdf7e27692d4' 
  AND token = '4wOEyCtij++srCeRNYS8YdIVI4qmvrq6Dib8wWSkP0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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