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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76f96bb2f79a608e2fedc83170cbd51bc91fc8fa61ea5e86aeee054066b9109c' 
  AND token = 'clmKBCAFqqETF7+s+be1QS5W3VdYR7jNrwPpYUSAANg=' 
  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"
    }
  }
}