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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc60b264a89ea6cf54875f611f420996dbd19d292f466bb0972d165653908047' 
  AND token = '/GjI3ozkd9ME/zYIsC7fdibFUIfRL7EBEa9MH4Z6mQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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