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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43254faf9eb89cfabce3ea8dd33528354fd093636dae994050ac2a5d8ce261b0' 
  AND token = 'Ty8VupfDrpJQHhfZE5uig2Wjsq+M2y+H3b5OlSfiIYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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