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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4265efe6707fbdde67f07db9a3ad5e842cd20b47ffc06d1c0a6a012a524e627d' 
  AND token = 'nBKc32dEaoXTUXa7pzODsq1CDChFu775GvpUOxh94io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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