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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66f0c3d25f88489047535fd41ea1cbdfc43347e4f975d5e114c74143335612ff' 
  AND token = 'baB3lvKCTB2GFRyITo/8PqS4BIQbjO7YMp0BIgSryms=' 
  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"
    }
  }
}