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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48aa4e58ce32d077ac41ff40ee8fffc764146979de88ac939c5335abc1ae0d69' 
  AND token = 'ZxMtjF8eN21odit3urO3RD/zfv9Mj4Lu8c8uxsw9cvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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