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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51fdab2da665b55ec98d6a1d9870c523ea3be8cf9c041589bd33e5115e8d9f23' 
  AND token = 'LS/08WRgsfEDUd7j2dT2GJp9MXRu6bR2i/Xf2SeXATs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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