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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef142c6cda4f6b0156e3d9d651b7a0f4592fa10af64391b10961ebd122fcc699' 
  AND token = '/X2FtjPdMzeFBJC0FYUjJTcRET6megKnXxu3Q/CJqh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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