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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23456d9864ed31c0e3f06ea1bb9586073eec40b88c090b094be4e75f14ba0a5e' 
  AND token = 'Zb0cOMjIUH3x3/i17St41lE3H9Zuh78qnVXdNWBeM4Y=' 
  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"
    }
  }
}