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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11de9b264ebf0fedd722825755d1cbf4fd3265e679e92f20da94b197c17b4823' 
  AND token = 'FW28vx4rfQZNxvYkp1MR6knyNtCU8V/DZ6SlXjHK45E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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