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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35e39dafe40c6440b4f7405ea56fe53138c2a694b830dbb87ba70e0180e1e166' 
  AND token = 'e9PPxt0lsW/3aURfkYr1cYEDLTDFWXiYoRX5FFHwCQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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