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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9b73f9a253081c63325437956bd53de3fb1ecad2dd3c4ea33a59dc3c3190cfe' 
  AND token = 'Xf42px1H3qG9mbIalIeGd68hPllSpPot5Qre06J0Sfo=' 
  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"
    }
  }
}