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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35814b8c80979d1d4f63fd825888ff37739f7ba98e32b36275c7fc5e3164797c' 
  AND token = 'XXWcBzeeYb3M0kX4tqPG3KrflhuJd/zW2IG9ELBa0c8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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