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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7524afe4617c9b2dbe13b41e9c2c26b923804e0488840d4266926ed684dd629a' 
  AND token = 'ttEnltBOL+JuFLD0XkA5EdviJXtCbQPd00ixBUSn/fg=' 
  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"
    }
  }
}