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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '712b0d3d55fd294778b5f946b69438156601411b88598a3975b231f873197cf9' 
  AND token = 'Xpd+h8mz5/b+kcZhtOmc8Vd+d07n3WL0UGDQ5Z0p9rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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