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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8539a945df16fe921ce05a66863f856f5f737a8327c94481c82bc4997fd3922' 
  AND token = 'Tva00b4CddNcDAjIKLlnYIN6g4M8sbPQyuwBoQ0DM0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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