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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dc6f8beeb242b0d7650faf2f97da3daedddc1cea90c3c4e266665d88c91c40b' 
  AND token = 'JOn/sC58qoRzfNIGWU/4ClI6viPIsdOLJRfg3ETiLcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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