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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '346984097de72e4110848d7b53db5a7953a1eed3c45fe31863e1fd2cdb8a22e0' 
  AND token = 'NS2YT4BSBQfdZ4ZDdCwnOuldGPnK2+YN0b51Fgn4tGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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