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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d30c4b7a6d7f99f20cb3d744b326f730cfa811cbe9ba5dbb0321de4fc8aa106' 
  AND token = 'Cvn1GKZcbJSWtLWWjaNswyBSxPbS2Fn/Uani6zNz63I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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